A glioma is a type of brain tumour that starts in the brain (primary brain tumour). More than half of all primary brain tumours are gliomas.
These tumours develop from the supporting cells (glial cells) in the brain or spinal cord. Different types of glioma are named after the types of glial cell.
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- Grade 1 tumours are called pilocytic astrocytoma
- Grade 2 tumours are called low-grade diffuse astrocytoma
- Grade 3 tumours are called anaplastic astrocytoma
- Grade 4 tumours are called glioblastoma multiforme (GBM)